DS90UB903QSQ/NOPB National Semiconductor, DS90UB903QSQ/NOPB Datasheet - Page 27

• Manufacturer Part Number: DS90UB903QSQ/NOPB
• Description: IC SER/DESER 10-43MHZ 18B 40LLP
• Manufacturer: National Semiconductor

Specifications of DS90UB903QSQ/NOPB

• Function: Serializer
• Data Rate: 900Mbps
• Input Type: LVCMOS
• Output Type: CML
• Number Of Inputs: 1
• Number Of Outputs: 1
• Voltage - Supply: 1.71 V ~ 1.89 V, 3 V ~ 3.6 V
• Operating Temperature: -40°C ~ 105°C
• Mounting Type: Surface Mount
• Package / Case: 40-WFQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

mitted by releasing the output and allowing it to be pulled-up
externally. The appropriate pull-up resistor values will depend
upon the total bus capacitance and operating speed. The
DS90UB903Q/904Q I
kbps according to I
To start any data transfer, the DS90UB903Q/904Q must be
configured in the proper I
as an I
determined by MODE pin. The Ser/Des interface acts as a
virtual bridge between Master Controller Unit (MCU) and the
remote device. When the MODE pin is set to High, the device
2
C slave proxy or master proxy depending on the mode
2
C specification.
2
C bus data rate supports up to 100
2
C mode. Each device can function
FIGURE 25. Basic Operation
FIGURE 23. Write Byte
FIGURE 24. Read Byte
27
is treated as a slave proxy; acts as a slave on behalf of the
remote slave. When addressing a remote peripheral or Seri-
alizer/Deserializer (not wired directly to the MCU), the slave
proxy will forward any byte transactions sent by the Master
controller to the target device. When MODE pin is set to Low,
the device will function as a master proxy device; acts as a
master on behalf of the I
devices must have complementary settings for the MODE
configuration. For example, if the Serializer MODE pin is set
to High then the Deserializer MODE pin must be set to Low
and vice-versa.
2
C master controller. Note that the
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